Overflow device for rainwater pumping station to isolate and collect initial rainwater

Abstract

The utility model provides a kind of overflow device for rainwater pump station isolation collection initial rainwater, belong to the technical field of initial rainwater collection in factory, including initial rainwater collection pond, the upper portion of initial rainwater collection pond is connected with water inlet channel, and the rotatable flap door for controlling initial rainwater to enter initial rainwater collection pond is provided between water inlet channel and initial rainwater collection pond;Water inlet channel is close to the side wall of rainwater pump station and is provided with overflow hole for guiding later rainwater into rainwater pump station after flap door is closed and is connected with water inlet channel and rainwater pump station.The utility model can improve initial rainwater collection efficiency, not to set gate for initial rainwater channel, simplify the process of collecting initial rainwater, without manual operation, avoid possible safety hazard of manual operation, reduce engineering cost.

Description

Technical Field

[0001] This utility model belongs to the field of initial rainwater collection technology in factories, and particularly relates to an overflow device for isolating and collecting initial rainwater in rainwater pumping stations. Background Technology

[0002] During the initial rainfall, the rainwater washes away pollutants from the ground surface (such as rooftops, roads, and factory floors), carrying a large amount of pollutants into water bodies. These pollutants include, but are not limited to: oil stains from motor vehicle emissions, particles from tire wear, de-icing agent residues, heavy metals (lead, zinc, copper, cadmium, etc.) scattered during industrial production, pesticide residues, and nutrients such as nitrogen and phosphorus.

[0003] Heavy metals and toxic organic compounds (such as benzene compounds and polycyclic aromatic hydrocarbons) can directly poison aquatic organisms and even affect human health through the food chain. Nutrients such as nitrogen and phosphorus can easily cause eutrophication, leading to explosive algal blooms (i.e., "algal blooms" or "red tides"), resulting in oxygen depletion, fish deaths, and disruption of the aquatic ecological balance. If initial rainwater is directly mixed into the urban sewage network, it may exceed the design capacity of sewage treatment plants, causing sewage overflows and untreated sewage to be directly discharged into natural water bodies, further aggravating water pollution.

[0004] Therefore, the scientific collection and treatment of initial rainwater runoff is a crucial measure for achieving source control of water pollution and building a sustainable urban ecosystem. However, traditional initial rainwater collection technologies have certain limitations: they rely on gate control within rainwater channels to separate initial and subsequent rainwater runoff—the gates are opened during initial runoff to guide the water into the collection pool, and closed during subsequent runoff to open the gates leading to the pumping station. This method requires a highly automated control system; the frequent opening and closing of the gates not only requires professional operation but also poses safety hazards such as electric shock and slipping during rainy weather. Furthermore, the installation and construction of the gates and their associated control systems are complex, increasing project costs and resource consumption, which is detrimental to cost reduction and efficiency improvement in settings such as factories. Utility Model Content

[0005] This invention addresses the issue of high requirements for automated control systems in traditional methods of collecting initial rainwater. It provides an overflow device for isolating and collecting initial rainwater in rainwater pumping stations, which improves initial rainwater collection efficiency, eliminates the need for gates in the initial rainwater flow channel, simplifies the initial rainwater collection process, eliminates the need for manual operation, avoids potential safety hazards associated with manual operation, and reduces project costs.

[0006] The technical solution adopted by this utility model for an overflow device for isolating and collecting initial rainwater in a rainwater pumping station is as follows:

[0007] An overflow device for isolating and collecting initial rainwater in a rainwater pumping station includes an initial rainwater collection tank, an inlet channel connected to the upper part of the initial rainwater collection tank, a rotatable flap gate for controlling the entry of initial rainwater into the initial rainwater collection tank between the inlet channel and the initial rainwater collection tank; and an overflow hole connected to the inlet channel and the rainwater pumping station, which is provided on the side wall of the inlet channel near the rainwater pumping station for guiding subsequent rainwater into the rainwater pumping station after the flap gate is closed.

[0008] A further improvement of the present invention is that the flap gate includes a door panel, which is rotatably connected to the side wall of the water inlet channel or the inlet of the initial rainwater collection tank via a hinge.

[0009] A further improvement of the present invention is that the initial rainwater collection tank is provided with a manhole for maintenance personnel to enter, a ladder for maintenance personnel to climb up and down, and a collection pit for collecting water accumulated at the bottom of the initial rainwater collection tank.

[0010] A further improvement of this utility model is that the cross-sectional area of ​​the overflow hole is not less than the cross-sectional area of ​​the inlet pipe of the inlet channel.

[0011] A further improvement of this utility model is that the water inlet channel is provided with a manhole and a ladder for inspecting, maintaining and repairing the inside of the water inlet channel.

[0012] A further improvement of this utility model is that it also includes a mobile pump for transporting initial rainwater from the initial rainwater collection tank to the initial rainwater treatment station. The input end of the mobile pump is connected to the initial rainwater collection tank, and the output end of the mobile pump is connected to the initial rainwater treatment station.

[0013] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows:

[0014] This invention, through the cooperation of a flap gate and an overflow hole, achieves automatic isolation and diversion of initial and subsequent rainwater without the need for gates or complex automated controls. The flap gate automatically opens to collect initial rainwater at the beginning of rainfall, and automatically closes once the water volume reaches the designed value. Subsequent rainwater naturally overflows to the pumping station. The entire process requires no manual intervention, significantly improving the efficiency and stability of initial rainwater collection.

[0015] This invention eliminates the gate, liquid level control device and supporting automation system in traditional technology, reducing the cost of equipment procurement, installation and commissioning; at the same time, no special personnel are required to operate the gate, reducing labor costs, and due to its simple structure, the later maintenance costs are also greatly reduced, which is more in line with the cost reduction and efficiency improvement needs of factories and other scenarios.

[0016] This invention avoids the safety hazards of electric shock and slipping that may be encountered when manually operating the gate in rainy weather. The entire device operates automatically by water power, fundamentally eliminating the safety risks of manual operation.

[0017] This utility model consists of basic components such as an inlet channel, a flap gate, an initial rainwater collection tank, and an overflow hole. The structure and principle are simple, and the connection of each component is reliable. Furthermore, both the inlet channel and the initial rainwater collection tank are equipped with manholes, ladders, and collection pits, which facilitates regular inspection and cleaning by maintenance personnel and ensures long-term stable operation of the system.

[0018] This invention can flexibly adjust the flap gate opening pressure, initial rainwater collection pool volume, and overflow hole size according to parameters such as rainfall intensity and catchment area in different scenarios, making it suitable for various initial rainwater collection scenarios such as factories, industrial parks, and main traffic arteries. Attached Figure Description

[0019] Figure 1 A plan view of an overflow device for isolating and collecting initial rainwater in a rainwater pumping station, provided by this utility model;

[0020] Figure 2 This utility model provides an overflow device for isolating and collecting initial rainwater in a rainwater pumping station. Figure 1 Sectional view at point AA.

[0021] In the attached diagram: 1. Initial rainwater collection tank; 2. Inlet channel; 3. Flap valve; 4. Overflow hole. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. In the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily obscuring the concept of this utility model.

[0023] like Figures 1-2 As shown, this embodiment provides an overflow device for isolating and collecting initial rainwater in a rainwater pumping station. The device includes an inlet channel 2, a flap gate 3, an initial rainwater collection pool 1, an overflow hole 4, and a mobile pump.

[0024] Specifically, the inlet channel 2 is constructed of reinforced concrete with a rectangular cross-section, 2m wide and 3m deep, designed to collect and transport rainwater. The side wall of inlet channel 2 is equipped with a 0.8m diameter manhole for maintenance and a φ20mm stainless steel ladder. The manhole is located 1.2m above the ground, facilitating access for maintenance personnel to inspect for blockages, structural damage, or other issues.

[0025] A flap gate 3 is located at the connection between the inlet channel 2 and the initial rainwater collection tank 1, and includes a door panel, a pivot, and a hinge. The door panel is made of 8mm thick 304 stainless steel, with dimensions of 1.5m × 1.2m. It is rotatably connected to the side wall of the inlet channel 2 via a 50mm diameter pivot made of No. 45 steel. The hinge is made of wear-resistant cast iron to ensure flexible rotation of the door panel. The opening pressure of the flap gate 3 is set to 0.5kPa (calculated based on the local initial rainwater flow rate). When the impact force of the initial rainwater reaches this pressure, the door panel can open naturally around the pivot, ensuring that the initial rainwater smoothly enters the collection tank.

[0026] The initial rainwater collection tank 1 is an underground reinforced concrete structure. Its volume is calculated based on the local maximum 24-hour rainfall event with a 5-year return period, a catchment area of ​​1000㎡, and an initial rainwater runoff coefficient (e.g., 0.6), and is set at 500m³. 3 The inner wall of the collection tank is coated with an epoxy resin anti-corrosion coating to prevent structural corrosion caused by long-term immersion in rainwater. A 1m diameter manhole is provided at the top of the tank, a ladder is welded to the inner wall, and a 1m×1m×0.5m water collection pit is provided at the bottom to collect the small amount of water that has accumulated at the bottom of the tank for easy cleaning later.

[0027] Overflow hole 4 is located on the side wall of inlet channel 2 near the rainwater pumping station. It is a circular hole with a diameter of 0.6m and a cross-sectional area of ​​0.28㎡, which is larger than the cross-sectional area of ​​the inlet pipe of inlet channel 2 (0.25㎡). The bottom elevation of the hole is H-2.75 (H is the local outdoor ground elevation). Overflow hole 4 is connected to the rainwater pumping station via an overflow inlet pipe made of HDPE with a diameter of 0.6m, ensuring that rainwater can flow smoothly into the rainwater pumping station in the future.

[0028] The mobile pump selected has a flow rate of 50m³ / h. 3 A diesel-driven mobile pump with a flow rate of 1 / h and a head of 15m has its inlet end connected to the collection pit of the initial rainwater collection tank 1 via a hose, and its outlet end connected to the inlet pipe network of the initial rainwater treatment station. It is used to transport the initial rainwater in the collection tank to the treatment station for treatment after the rainfall stops.

[0029] In the above embodiments, the size, material and parameters of each component can be adjusted according to actual engineering needs. For example, the material of the flap gate 3 can be fiberglass to adapt to industrial scenarios with strong corrosion; the volume of the initial rainwater collection pool 1 can be increased accordingly according to the expansion of the water catchment area; the cross-sectional area of ​​the overflow hole 4 can be optimized according to the actual flow rate of the inlet channel 2 to ensure smooth overflow of rainwater in the later stage.

[0030] The working principle of the overflow device for isolating and collecting initial rainwater in a rainwater pumping station in this embodiment is as follows:

[0031] In the initial stage of rainfall: Rainwater flows into the inlet channel 2 through the surface runoff, and the water flows along the channel towards the flap gate 3. When the impact force of the water flow reaches the opening pressure of 0.5 kPa for the flap gate 3, the gate rotates around the pivot and opens, and the initial rainwater enters the initial rainwater collection tank 1 through the flap gate 3 to begin collection.

[0032] During rainfall: As rainfall continues, the water level in the initial rainwater collection tank 1 gradually rises. When the water volume in the tank reaches the calculated requirement of 500m³... 3 At this time, the water pressure on both sides of the flap gate 3 tends to be balanced. At this point, the water level in the initial rainwater collection tank 1 is the same as the water level in the inlet channel 2. The flap gate 3 closes automatically under its own weight and water pressure, thus isolating the initial rainwater from the later rainwater and preventing mixing. At this time, the later rainwater cannot enter the collection tank due to the obstruction of the flap gate 3. It gradually accumulates in the inlet channel 2. After the water level rises to the bottom elevation of the overflow hole 4, it flows into the rainwater pumping station through the overflow hole 4 and the overflow inlet pipe. Finally, it is pumped by the pumps in the pumping station and discharged into natural water bodies.

[0033] After the rainfall stops: the water level in the suction tank of the rainwater pumping station gradually decreases. When it drops to the stop level of the rainwater pump, the rainwater pump will automatically stop running.

[0034] Initial rainwater treatment stage: After the weather clears up, the operator puts the inlet hose of the mobile pump into the collection pit of the initial rainwater collection tank 1, starts the mobile pump, and transports the initial rainwater in the tank to the initial rainwater treatment station for treatment (such as coagulation sedimentation, filtration, disinfection, etc.). After treatment to meet the standards, it is discharged or reused.

[0035] In the above embodiments, this utility model provides an overflow device for isolating and collecting initial rainwater in rainwater pumping stations. This utility model, through the cooperation of a flap gate and an overflow hole, achieves automatic isolation and diversion of initial and subsequent rainwater without the need for gates or complex automated control. The flap gate automatically opens to collect initial rainwater at the beginning of rainfall, and automatically closes after the water volume reaches the target level, allowing subsequent rainwater to overflow naturally to the pumping station. The entire process requires no manual intervention, significantly improving the efficiency and stability of initial rainwater collection. This utility model eliminates the gates, level control devices, and supporting automated systems found in traditional technologies, reducing the costs of equipment procurement, installation, and commissioning. Simultaneously, it eliminates the need for dedicated personnel to operate the gates, reducing labor costs. Furthermore, due to its simple structure, subsequent maintenance costs are significantly reduced, better meeting the cost reduction and efficiency improvement needs of factories and other similar scenarios. This utility model avoids the safety hazards of electric shock and slipping that may occur when manually operating gates in rainy weather. This device operates automatically using hydraulic power, fundamentally eliminating the safety risks associated with manual operation. It consists of basic components such as an inlet channel, a flap gate, an initial rainwater collection tank, and an overflow hole. The structure is simple, and the connections between components are reliable. Both the inlet channel and the initial rainwater collection tank are equipped with manholes, ladders, and collection pits, facilitating regular inspection and cleaning by maintenance personnel and ensuring long-term stable system operation. This device allows for flexible adjustment of the flap gate opening pressure, the initial rainwater collection tank volume, and the overflow hole size based on parameters such as rainfall intensity and catchment area in different scenarios, making it suitable for various initial rainwater collection scenarios, including factories, industrial parks, and main traffic arteries.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. An overflow device for isolating and collecting initial rainwater in a rainwater pumping station, characterized in that: It includes an initial rainwater collection tank (1), the upper part of which is connected to an inlet channel (2), and a rotatable flap gate (3) is provided between the inlet channel (2) and the initial rainwater collection tank (1) to control the initial rainwater entering the initial rainwater collection tank (1); the side wall of the inlet channel (2) near the rainwater pumping station is provided with an overflow hole (4) for introducing the later rainwater into the rainwater pumping station after the flap gate (3) is closed, and connecting the inlet channel (2) and the rainwater pumping station.

2. The overflow device for isolating and collecting initial rainwater in a rainwater pumping station according to claim 1, characterized in that: The flap gate (3) includes a door panel, which is rotatably connected to the side wall of the water inlet channel (2) or the inlet of the initial rainwater collection tank (1) via a hinge.

3. The overflow device for isolating and collecting initial rainwater in a rainwater pumping station according to claim 1, characterized in that: The initial rainwater collection tank (1) is equipped with a manhole for maintenance personnel to enter, a ladder for maintenance personnel to go up and down, and a water collection pit for collecting water accumulated at the bottom of the initial rainwater collection tank (1).

4. The overflow device for isolating and collecting initial rainwater in a rainwater pumping station according to claim 1, characterized in that: The cross-sectional area of ​​the overflow hole (4) is not less than the cross-sectional area of ​​the inlet pipe of the inlet channel (2).

5. An overflow device for isolating and collecting initial rainwater in a rainwater pumping station according to claim 1, characterized in that: The water inlet channel (2) is provided with a manhole and ladder for inspecting and maintaining the interior of the water inlet channel (2).

6. The overflow device for isolating and collecting initial rainwater in a rainwater pumping station according to claim 1, characterized in that: It also includes a mobile pump for transporting initial rainwater in the initial rainwater collection tank (1) to the initial rainwater treatment station, wherein the input end of the mobile pump is connected to the initial rainwater collection tank (1) and the output end of the mobile pump is connected to the initial rainwater treatment station.

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